If you need to have passport photos taken in Cuenca, Ecuador then head to Bolivar 4-95 y Mariano Cueva. Right on the corner is a great little photo studio where they are used to taking photos for passports and other government documents, so they know the deal. You don’t have to call and make an appointment; they take walk-ins at Galo Torres Fotografias.
You’ll receive 8 or 12 photos for only a couple dollars and since it is all digital you won’t have to wait long. We had ours taken here and we were in and out in minutes.